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EDITED BY

FREDERICK W. PUTNAM,

Permanent Secretary.

Corestry

PRINTED AT

THE SALEM PRESS, SALEM,

MASS.

Ferestry

Erelv.
Ferid Museum
1-6-30

TABLE OF CONTENTS.

IN GENERAL SESSIONS.

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ADDRESS OF VICE PRESIDENT HENRY T. EDDY

Phenomena observed upon the solar surface from 1881 to 1884. By S. J. PERRY

Description of a model of a ruled cubic surface known as the cylindroid. By

ROBERT S. BALL

On a geometrical interpretation of the linear bilateral quaternion equation.

By IRVING STRINGHAM

Description of the Leander McCormick Observatory of the University of Vir-

ginia. By ORMOND STONE

On the fundamental formula of statistical mechanics, with applications to as.

tronomy and thermodynamics. By J. WILLARD GIBBS

Linear functions of points, lines and planes. By E. W. HYDE

Colors of the stars. By E. C. PICKERING

On the colors of variable stars. By S. C. CHANDLER, jr.

On the original graduation of the Harvard College meridian circle in situ.

By W. A. ROGERS and GEO. B. CLARK

The average asteroid orbit and the asteroid ring. By M. W. HARRINGTON.

Micrometric observations of Jupiter's third satellite. By DAVID P. TODD

On the course of the corrections to the heliocentric longitudes of Newcomb's

tables of Uranus and Neptune. By DAVID P. TODD

On the general values of the obliquity of the ecliptic, and of the precession and

inclination of the equator to the invariable plane, taking into account

terms of the second order. By J. C. ADAMS

Note on Newton's theory of atmospheric refraction, and on his method of

finding the motion of the moon's apogee. By J. C. ADAMS

The nebulæ. By LEWIS SWIFT

A new apparatus for the study of Boyle's law. By LEROY C. Cooler. (Title)

The lunar aurora. By John HAYWOOD. (Title)

A. A. A. S., VOL. XXXIII.

А

(1)

On the measurement of an international arc of meridian through the Ameri.

can continent, from Cape Horn to the Arctic regions. By TRELAWNEY

SAUNDERS. (Title)
Results of observations and experiments with an almucantar or four inches

aperture, at the Harvard College Observatory. By S.C. CHANDLER, jr.

(Title)

The geodetic work of the U. S. coast and geodetic survey. By J. HOWARD

GORE. (Title)

A criterion for the rejection of doubtful observations. By MANSFIELD MER-

RIMAN. (Title)

Harmonic motion in stellar systems. By PLINY EARLE CHASE. (Title)

On the mean temperature of the two hemispheres of the earth. By H. HEN-

NESSY. (Title)

On the constitution of the earth and planets. By H. HENNESSY. (Title)

On an international standard for measurements. By H. HENNESSY. (Title)

Systematic errors in stellar magnitudes. By E. C. PICKERING. (Title)

On the magnitude of the errors which may be introduced in the reduction of

an observed system of stellar coördinates to an assumed normal system

by graphic methods. By WM. A. ROGERS. (Title)

Analysis of the formula for the moon's latitude as affected by the figure of the

earth. By John N. STOCKWELL. (Title).

On an indirect solution of the equation

da

da a а

d, т

do

3

dt

di2

da

to the 6th power of the time, in which is a function of four variables.

dt

By Wm. A. ROGERS. (Title)

A brief account of some preliminary experiments in the construction of clocks

of precision. By LEONARD WALDO. (Title)

A collection of formulæ for the area of a plane triangle. By MARCUS BAKER.

(Title)

On the visibility of faint objects under red illumination. By G. W. Hough.

(Title)

The products of vectors. By SAMUEL EMERSON. (Title)

Temporary stars. By DANIEL KIRKWOOD. (Title)

Mechanical arithmetic, illustrated by the averaging machine. By W. S. AU.

CHINCLOSs. (Title)

675

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blindness, acuteness of vision and hearing, with the results obtained by it

on the Pennsylvania railroad. By WILLIAM THOMSON

Notes on ancroids. By M.W. HARRINGTON

120

129
By C. F. MABERY

An absolute sensitometer. By G. W. HOUGH

An experiment for illustrating the conversion of mechanical energy into heat.

By CHAS. E. MUNROE

On the variation of the resistance of carbon under pressure. By T. C. MEN-

DENHALL

A possible method of electrical communication between vessels at sea. By

A. GRAHAM BELL

On the intensity of sound. II. The energy used by an organ pipe. By C. K.

WEAD

A preliminary note on the action of acids upon iron in the magnetic field. By

EDWARD W. NICHOLS

Local and topical weather cards. By W. M. DAVIS

On a proof of contact theory of electricity. By A. E. DOLBEAR

On comparative cost of electric light, and oxycalcium light. By A. F. DOL-

BEAR

Electric discharges in relation to the equilibrium of gaseous atmospheres. By

JAMES DEWAR

On the distribution of potential in conductors experiencing the electromag.

netic effects discovered by Hall. By WILLIAM THOMPSON. (Title).

On a standard tangent galvanometer. By SILVANUS THOMPSON. (Title)

On the government of electric motors. By SILVANUS THOMPSON. (Title)

Change in rainfall of Virginia. By J. R. PURDIE. (Title)

The Princeton Meteorological Observatory. By WILLIAM LIBBEY, jr. (Title)

A form of apparatus for determining the diathermacy of air and gases. By

JOHN R. PADDOCK. (Title) .

A proposed method of determining the magnetic dip by means of a magnetic

pendulum. By MARCUS BAKER. (Title)

Description of a galvanometer for demonstrating the internal current trans.

mitted through the liquid within a voltaic cell. By CONRAD W. COOKE.

(Title).

Thermal belts. By J. W. CHICKERING, jr. (Title)

Geometrical methods in the theory of refraction at one or more surfaces. By

JAMES LOUDON. (Title)

Some relations of positive and negative electricity. By H.W.EATON. (Title)

A method of distributing weather forecast by means of railroad trains, etc.

By JOHN A. MILLER. (Title)

Note on the periodic modification of electro-static induction. By H. S. CAR-

HART. (Title)

On the sensitiveness of the eye to colors of a low degree of saturation. By

E. L. NICHOLS. (Title)

A spectrophotometric study of pigments. By E. L. NICHOLS. (Title)

First steps toward a general system of observations of atmospheric electricity.

By CLEVELAND ABBE. (Title)

Organization of seismological observations. By CLEVELAND ABBE. (Title)

Methods of verifying weather probabilities. By CLEVELAND ABBE. (Title)

Standards of barometry and thermometry. By CLEVELAND ABBE. (Title)

On the rotation of the equipotential lines of an electric current by magnetic

action. By E. H. HALL. (Title)

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Continuous etherification. By L. M. NORTON and C. 0. PRESCOTT

Anthracene from water-gas tar. By ARTHUR H. ELLIOTT

On the chemistry of fish. By W.0. ATWATER

163

16+

170

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